Easy enough to imply it from all of the other comments in the thread, and the fact that the op referred to the ThinkPad in the title. You’re correct, and it’s not your fault the op used the wrong word, but context indicates that they were talking about desktop PCs.
Makes you connectable. If you don’t forward ports for your torrent client you can only connect to peers who are port forwarding, meaning you will download and upload more slowly in most cases.